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Long-term Debt - Trust Preferred Securities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Debt Disclosure [Abstract]
Trust securities redeemed, carrying value	$ 1

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- Definition

Assets Held-In-Trust, Carrying Value

+ References

No definition available.

+ Details

Name:	bac_AssetsHeldInTrustCarryingValue
Namespace Prefix:	bac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration